kernel.git/drivers/spi/spi.c, branch linux-4.16.y

spi: Fix unregistration of controller with fixed SPI bus number

2018-04-24T07:42:51Z

commit 613bd1ea387bb48b7c9a71a0bb451ac15cfbbc01 upstream. Commit 9b61e302210e (spi: Pick spi bus number from Linux idr or spi alias) ceased to unregister SPI buses with fixed bus numbers. Moreover this is visible only if CONFIG_SPI_DEBUG=y is set or when trying to re-register the same SPI controller. rmmod spi_pxa2xx_platform (with CONFIG_SPI_DEBUG=y): [ 26.788362] spi_master spi1: attempting to delete unregistered controller [spi1] modprobe spi_pxa2xx_platform: [ 37.883137] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:19.0/pxa2xx-spi.12/spi_master/spi1' [ 37.894984] CPU: 1 PID: 1467 Comm: modprobe Not tainted 4.16.0-rc4+ #21 [ 37.902384] Call Trace: ... [ 38.122680] kobject_add_internal failed for spi1 with -EEXIST, don't try to register things with the same name in the same directory. [ 38.136154] WARNING: CPU: 1 PID: 1467 at lib/kobject.c:238 kobject_add_internal+0x2a5/0x2f0 ... [ 38.513817] pxa2xx-spi pxa2xx-spi.12: problem registering spi master [ 38.521036] pxa2xx-spi: probe of pxa2xx-spi.12 failed with error -17 Fix this by not returning immediately from spi_unregister_controller() if idr_find() doesn't find controller with given ID/bus number. It finds only those controllers that were registered with dynamic SPI bus numbers. Only conditional cleanup between dynamic and fixed bus numbers is to remove allocated IDR. Fixes: 9b61e302210e (spi: Pick spi bus number from Linux idr or spi alias) Cc: stable@vger.kernel.org Signed-off-by: Jarkko Nikula Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman

spi: Fix scatterlist elements size in spi_map_buf

2018-04-24T07:42:51Z

commit ce99319a182fe766be67f96338386f3ec73e321c upstream. When SPI transfers can be offloaded using DMA, the SPI core need to build a scatterlist to make sure that the buffer to be transferred is dma-able. This patch fixes the scatterlist entry size computation in the case where the maximum acceptable scatterlist entry supported by the DMA controller is less than PAGE_SIZE, when the buffer is vmalloced. For each entry, the actual size is given by the minimum between the desc_len (which is the max buffer size supported by the DMA controller) and the remaining buffer length until we cross a page boundary. Fixes: 65598c13fd66 ("spi: Fix per-page mapping of unaligned vmalloc-ed buffer") Signed-off-by: Maxime Chevallier Signed-off-by: Mark Brown Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

Merge remote-tracking branch 'spi/topic/core' into spi-next

2017-11-10T21:33:43Z

spi: fix IDR collision on systems with both fixed and dynamic SPI bus numbers

2017-11-03T11:08:18Z

On systems where some controllers get a dynamic ID assigned and some have a fixed number from DT, the current implemention might run into an IDR collision if the dynamic controllers gets probed first and get an IDR number, which is later requested by the controller with the fixed numbering. When this happens the fixed controller will fail to register with the SPI core. Fix this by skipping all known alias numbers when assigning the dynamic IDs. Fixes: 9b61e302210e (spi: Pick spi bus number from Linux idr or spi alias) Signed-off-by: Lucas Stach Signed-off-by: Mark Brown

spi: document odd controller reference handling

2017-10-31T11:09:43Z

Document the fact that a reference to the controller is dropped as part of deregistration. This is an odd pattern as the reference is typically taken in __spi_alloc_controller() rather than spi_register_controller(). Most controller drivers gets it right these days and notably the device-managed interface relies on this behaviour. Signed-off-by: Johan Hovold Signed-off-by: Mark Brown

spi: fix use-after-free at controller deregistration

2017-10-31T11:09:23Z

The controller is typically freed as part of device_unregister() so store the bus id before deregistration to avoid use-after-free when the id is later released. Fixes: 9b61e302210e ("spi: Pick spi bus number from Linux idr or spi alias") Signed-off-by: Johan Hovold Signed-off-by: Mark Brown Cc: stable

Merge tag 'acpi-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2017-09-05T19:45:03Z

Pull ACPI updates from Rafael Wysocki: "These include a usual ACPICA code update (this time to upstream revision 20170728), a fix for a boot crash on some systems with Thunderbolt devices connected at boot time, a rework of the handling of PCI bridges when setting up device wakeup, new support for Apple device properties, support for DMA configurations reported via ACPI on ARM64, APEI-related updates, ACPI EC driver updates and assorted minor modifications in several places. Specifics: - Update the ACPICA code in the kernel to upstream revision 20170728 including: * Alias operator handling update (Bob Moore). * Deferred resolution of reference package elements (Bob Moore). * Support for the _DMA method in walk resources (Bob Moore). * Tables handling update and support for deferred table verification (Lv Zheng). * Update of SMMU models for IORT (Robin Murphy). * Compiler and disassembler updates (Alex James, Erik Schmauss, Ganapatrao Kulkarni, James Morse). * Tools updates (Erik Schmauss, Lv Zheng). * Assorted minor fixes and cleanups (Bob Moore, Kees Cook, Lv Zheng, Shao Ming). - Rework the initialization of non-wakeup GPEs with method handlers in order to address a boot crash on some systems with Thunderbolt devices connected at boot time where we miss an early hotplug event due to a delay in GPE enabling (Rafael Wysocki). - Rework the handling of PCI bridges when setting up ACPI-based device wakeup in order to avoid disabling wakeup for bridges prematurely (Rafael Wysocki). - Consolidate Apple DMI checks throughout the tree, add support for Apple device properties to the device properties framework and use these properties for the handling of I2C and SPI devices on Apple systems (Lukas Wunner). - Add support for _DMA to the ACPI-based device properties lookup code and make it possible to use the information from there to configure DMA regions on ARM64 systems (Lorenzo Pieralisi). - Fix several issues in the APEI code, add support for exporting the BERT error region over sysfs and update APEI MAINTAINERS entry with reviewers information (Borislav Petkov, Dongjiu Geng, Loc Ho, Punit Agrawal, Tony Luck, Yazen Ghannam). - Fix a potential initialization ordering issue in the ACPI EC driver and clean it up somewhat (Lv Zheng). - Update the ACPI SPCR driver to extend the existing XGENE 8250 workaround in it to a new platform (m400) and to work around an Xgene UART clock issue (Graeme Gregory). - Add a new utility function to the ACPI core to support using ACPI OEM ID / OEM Table ID / Revision for system identification in blacklisting or similar and switch over the existing code already using this information to this new interface (Toshi Kani). - Fix an xpower PMIC issue related to GPADC reads that always return 0 without extra pin manipulations (Hans de Goede). - Add statements to print debug messages in a couple of places in the ACPI core for easier diagnostics (Rafael Wysocki). - Clean up the ACPI processor driver slightly (Colin Ian King, Hanjun Guo). - Clean up the ACPI x86 boot code somewhat (Andy Shevchenko). - Add a quirk for Dell OptiPlex 9020M to the ACPI backlight driver (Alex Hung). - Assorted fixes, cleanups and updates related to ACPI (Amitoj Kaur Chawla, Bhumika Goyal, Frank Rowand, Jean Delvare, Punit Agrawal, Ronald Tschalär, Sumeet Pawnikar)" * tag 'acpi-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (75 commits) ACPI / APEI: Suppress message if HEST not present intel_pstate: convert to use acpi_match_platform_list() ACPI / blacklist: add acpi_match_platform_list() ACPI, APEI, EINJ: Subtract any matching Register Region from Trigger resources ACPI: make device_attribute const ACPI / sysfs: Extend ACPI sysfs to provide access to boot error region ACPI: APEI: fix the wrong iteration of generic error status block ACPI / processor: make function acpi_processor_check_duplicates() static ACPI / EC: Clean up EC GPE mask flag ACPI: EC: Fix possible issues related to EC initialization order ACPI / PM: Add debug statements to acpi_pm_notify_handler() ACPI: Add debug statements to acpi_global_event_handler() ACPI / scan: Enable GPEs before scanning the namespace ACPICA: Make it possible to enable runtime GPEs earlier ACPICA: Dispatch active GPEs at init time ACPI: SPCR: work around clock issue on xgene UART ACPI: SPCR: extend XGENE 8250 workaround to m400 ACPI / LPSS: Don't abort ACPI scan on missing mem resource mailbox: pcc: Drop uninformative output during boot ACPI/IORT: Add IORT named component memory address limits ...

Merge remote-tracking branches 'spi/topic/cadence', 'spi/topic/dt', 'spi/topic/ep93xx' and 'spi/topic/falcon' into spi-next

2017-09-04T14:51:18Z

spi: Kernel coding style fixes

2017-08-17T16:56:11Z

Earlier commit: "spi: Pick spi bus number from Linux idr or spi alias" (SHA1:9b61e302210eba55768962f2f11e96bb508c2408) has introduced some checkpatch issues. As pointed by Lukas Wunner this patch does the following: - remove whitespaces - fix warnings, suspect code indent for conditional statements - fix errors, code indent should use tabs - remove spaces at the start of the line Signed-off-by: Suniel Mahesh Signed-off-by: Mark Brown

spi: Pick spi bus number from Linux idr or spi alias

2017-08-16T15:38:03Z

Modify existing code, for automatically picking the spi bus number based on Linux idr scheme as mentioned in FIXME. This patch does the following: (a) Remove the now unnecessary code which was allocating bus numbers using ATOMIC_INIT and atomic_dec_return macros. (b) If we have an alias, pick the bus number from alias ID (c) Convert to linux idr interface Signed-off-by: Suniel Mahesh Signed-off-by: Karthik Tummala Tested-by: Karthik Tummala Signed-off-by: Mark Brown